[lldb] Add OpenBSD signals (#123005)

Signals 1-32 are matching the default UNIX platform.

There are platform specific ones above 32.

Author: brad0

lldb/source/Plugins/Process/Utility/CMakeLists.txt

@@ -15,6 +15,7 @@ add_lldb_library(lldbPluginProcessUtility
   NativeRegisterContextDBReg_x86.cpp
   NativeRegisterContextRegisterInfo.cpp
   NetBSDSignals.cpp
+  OpenBSDSignals.cpp
   RegisterContext_x86.cpp
   RegisterContextDarwin_arm.cpp
   RegisterContextDarwin_arm64.cpp

lldb/source/Plugins/Process/Utility/OpenBSDSignals.cpp

@@ -0,0 +1,69 @@
+//===-- OpenBSDSignals.cpp ------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "OpenBSDSignals.h"
+
+#ifdef __OpenBSD__
+#include <csignal>
+
+#define ADD_SIGCODE(signal_name, signal_value, code_name, code_value, ...)     \
+  static_assert(signal_name == signal_value,                                   \
+                "Value mismatch for signal number " #signal_name);             \
+  static_assert(code_name == code_value,                                       \
+                "Value mismatch for signal code " #code_name);                 \
+  AddSignalCode(signal_value, code_value, __VA_ARGS__)
+#else
+#define ADD_SIGCODE(signal_name, signal_value, code_name, code_value, ...)     \
+  AddSignalCode(signal_value, code_value, __VA_ARGS__)
+#endif /* ifdef __OpenBSD */
+
+using namespace lldb_private;
+
+OpenBSDSignals::OpenBSDSignals() : UnixSignals() { Reset(); }
+
+void OpenBSDSignals::Reset() {
+  UnixSignals::Reset();
+
+  // clang-format off
+  // SIGILL
+  ADD_SIGCODE(SIGILL, 4, ILL_ILLOPC, 1, "illegal opcode");
+  ADD_SIGCODE(SIGILL, 4, ILL_ILLOPN, 2, "illegal operand");
+  ADD_SIGCODE(SIGILL, 4, ILL_ILLADR, 3, "illegal addressing mode");
+  ADD_SIGCODE(SIGILL, 4, ILL_ILLTRP, 4, "illegal trap");
+  ADD_SIGCODE(SIGILL, 4, ILL_PRVOPC, 5, "privileged opcode");
+  ADD_SIGCODE(SIGILL, 4, ILL_PRVREG, 6, "privileged register");
+  ADD_SIGCODE(SIGILL, 4, ILL_COPROC, 7, "coprocessor error");
+  ADD_SIGCODE(SIGILL, 4, ILL_BADSTK, 8, "internal stack error");
+  ADD_SIGCODE(SIGILL, 4, ILL_BTCFI,  9, "IBT missing on indirect call");
+
+  // SIGFPE
+  ADD_SIGCODE(SIGFPE, 8, FPE_INTDIV, 1, "integer divide by zero");
+  ADD_SIGCODE(SIGFPE, 8, FPE_INTOVF, 2, "integer overflow");
+  ADD_SIGCODE(SIGFPE, 8, FPE_FLTDIV, 3, "floating point divide by zero");
+  ADD_SIGCODE(SIGFPE, 8, FPE_FLTOVF, 4, "floating point overflow");
+  ADD_SIGCODE(SIGFPE, 8, FPE_FLTUND, 5, "floating point underflow");
+  ADD_SIGCODE(SIGFPE, 8, FPE_FLTRES, 6, "floating point inexact result");
+  ADD_SIGCODE(SIGFPE, 8, FPE_FLTINV, 7, "invalid floating point operation");
+  ADD_SIGCODE(SIGFPE, 8, FPE_FLTSUB, 8, "subscript out of range");
+
+  // SIGBUS
+  ADD_SIGCODE(SIGBUS, 10, BUS_ADRALN, 1, "invalid address alignment");
+  ADD_SIGCODE(SIGBUS, 10, BUS_ADRERR, 2, "non-existent physical address");
+  ADD_SIGCODE(SIGBUS, 10, BUS_OBJERR, 3, "object specific hardware error");
+
+  // SIGSEGV
+  ADD_SIGCODE(SIGSEGV, 11, SEGV_MAPERR, 1, "address not mapped to object",
+                SignalCodePrintOption::Address);
+  ADD_SIGCODE(SIGSEGV, 11, SEGV_ACCERR, 2, "invalid permissions for mapped object",
+                SignalCodePrintOption::Address);
+
+  //        SIGNO NAME           SUPPRESS STOP   NOTIFY DESCRIPTION
+  //        ===== ============== ======== ====== ====== ========================
+  AddSignal(32,   "SIGTHR",      false,   false, false, "thread library AST");
+  // clang-format on
+}

lldb/source/Plugins/Process/Utility/OpenBSDSignals.h

@@ -0,0 +1,27 @@
+//===-- OpenBSDSignals.h ----------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLDB_SOURCE_PLUGINS_PROCESS_UTILITY_OPENBSDSIGNALS_H
+#define LLDB_SOURCE_PLUGINS_PROCESS_UTILITY_OPENBSDSIGNALS_H
+
+#include "lldb/Target/UnixSignals.h"
+
+namespace lldb_private {
+
+/// OpenBSD specific set of Unix signals.
+class OpenBSDSignals : public UnixSignals {
+public:
+  OpenBSDSignals();
+
+private:
+  void Reset() override;
+};
+
+} // namespace lldb_private
+
+#endif // LLDB_SOURCE_PLUGINS_PROCESS_UTILITY_OPENBSDSIGNALS_H

lldb/source/Target/UnixSignals.cpp

@@ -10,6 +10,7 @@
 #include "Plugins/Process/Utility/FreeBSDSignals.h"
 #include "Plugins/Process/Utility/LinuxSignals.h"
 #include "Plugins/Process/Utility/NetBSDSignals.h"
+#include "Plugins/Process/Utility/OpenBSDSignals.h"
 #include "lldb/Host/HostInfo.h"
 #include "lldb/Utility/ArchSpec.h"
 #include <optional>
@@ -32,10 +33,11 @@ lldb::UnixSignalsSP UnixSignals::Create(const ArchSpec &arch) {
   case llvm::Triple::Linux:
     return std::make_shared<LinuxSignals>();
   case llvm::Triple::FreeBSD:
-  case llvm::Triple::OpenBSD:
     return std::make_shared<FreeBSDSignals>();
   case llvm::Triple::NetBSD:
     return std::make_shared<NetBSDSignals>();
+  case llvm::Triple::OpenBSD:
+    return std::make_shared<OpenBSDSignals>();
   default:
     return std::make_shared<UnixSignals>();
   }